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Rheem Evaporator Coil Box

I am running into a common problem here and I am wondering if there is an easier solution than the one I dread. There are a lot of horizontal units in this area with the old Rheem Evaporator boxes (RCAH-Z037S for example). We used to simply slide the old coil out and the new one in and go on. I am having trouble finding these slab coils and I am wondering if anyone knows where a 13 seer slab coil that will fit into these old boxes can be found. I think that Airco makes a slab coil, but the box size is different. Any advice will help.

I am fearing that us service techs are going to be sheet metal men soon!

How about the upflow and downflow changeouts. Are the new coils usually fitting in the old cabinets? This issue concerns me because there are a lot of people out of work in my area. They call me in hopes of saving money. I usually try to change compressor or repair otherwise, but sometimes I do have to change out a unit.

Check out the Rheem Model RCTA-A***. Its made for Rheem by ADP. I know the overall width of the cabinet is only 1/2" different but not sure about the slab itself. It has changed to a TXV instead of the cap tube and piston setup.